Switchboard construction for alternating-current controllers.



A. SUN DH. SWITOHBOARD CONSTRUCTION FOR ALTERNATING CURRENT CONTROLLERS 1 I APPLICATION FILED MAY 27, 908.

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' Patented Dec. 12, 1911.

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Patented Dec. 12, 1911.

jvgywtoz 7 (MM A. SUNDH. SWITGHBOARD CONSTRUCTION FOR ALTERNATING- CURRENT CONTROLLERS.

APPLIUATIONJ'ILED MAY 27, 1908.

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Qvi/bwwacoz 1 Jul W 14 A UNITED STATES PATENT OFFICE.

AUGUST SUNDH, or

or JERSEY CITY, NEW JERSEY,

YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY,

A CORPQRATTON OF NEW JERSEY.

SWITCHBOARD CONSTRUCTION FOR ALTERNATING-CURRENT CONTROLLERS.

Specification of -Letters Patent.

Patented Dee-12, 1911.

Application filed May 27, 1908. Serial No. 435,356.

To all whom it may concern:

Be it' known that I, AUGUST Sunnis, a citizen of the United States, residing a Yonkers, in the'county of Westchester and State of New York, have invented a new and useful Improvement in Switchboard Construction for Alternating-Current Controllers, of which the following is a specification.

My invention relates to means for reducing and absorbing vibrations in alternating current electrical apparatus.

In apparatus of this character, especially where electromagnets are energized by alternating currents, the rapid vibrations produced in the magnet'a'nd parts connected thereto result in a humming noise'which is objectionable in many places where such magnets might be used. This noise is due principally to the which the elect-romagnet is connected. For instance, if a magnet which is excited by an alternating current is mounted on, a switch-board, the vibrations set up in the magnet-frame are transmitted to the switch-- board which acts as a resonator or squndingboard to magnify the sound. The vibra-v tions of the switch-board are transmitted to the walls, floor or other part on which the switch-board is mounted, and still further increase the noise.

One of the objects of the present invention is to reduce or practically eliminate such noise by interposing between the magnet and parts associated therewith means for absorbing or reducing such vibrations.

Other objects of the invention will appear hereinafter, the novel combinations of elements being set forth in the appended claims.

Referring to the drawings, Figure 1 is a front elevation of a switchboard and switch mechanism mounted thereon to which my invention is adapted to be applied; Fig. 2

is a sectional side elevation ofa portion of the switch-board and an electromagnetic switch mounted thereon; Fig. 3 is a fragmental-y view, partly in section, showing means interposed between the magnet frame and switchboard and also between the armature and switch-board for absorbing vis brations; Fi Q 4 isa front elevation, partly in section, 0% a portion of Fig. 3; Fig. .5 is a sectional elevation of a corner of the vibration of parts to.

. switchboard and the standard on which it 1s mounted; and Fig. 6 is a sectional plan view of parts shown in Fig. 5.

To illustrate a specific application of the present invention, a switch-board 1 is herein shown, on which is mounted controlling mechanism for an electric elevator system. A description of such mechanism need not be given herein, except in so faras necessary to clearly set forth the present invention as applied thereto. The electromagnetic reversing switches R, R mounted on the switch-board each comprises a switch lever 2 pivoted at 3, to a bracket 4 secured to the switchboard 1. The switch lever carries at its upper end a contact5 adapted to engage a contact 6 mounted on the. switch-board. The Switch is normally held closed by a spring 7. The electromagnet for opening the switch is mounted on the back of the switch-board and comprises a magnet coil 8, a magnetic frame 9 secured to the switchthe magnet is deenergized the armature is secured to or forms part of a lever 11 which extends through an opening in the switch-board and is pivoted between the lugs 12 formed on the bracket 4-. hen the magnet is denergized the armature drops and a shoulder 13 formed on the lever 11 strikes'the antifriction roller 14 on the switch lever and opens the switch.

The method of securing the magnet frame 9 to the switch-board in order to deaden the vibrations due to current alternations will now be described. The magnet frame is in this instance secured to the switch-board by.

means of bolts 15, one of which is shown in detail .in'Fig. 3. This bolt extends through the switch-board and a flange 16 formed on the magnet frame. The flange 16 instead of being clamped directly against the switch-board in the usual way, is separated therefrom by a section 17 of material which will absorb the vibrations of the magnet-frame and prevent their being transmittcd to the switchboard? It has been found in practice that rubber is well adapted for thispurpose, although various other materials, such asleather, paper, asbestos, lead, metal'springs, etc, will serve the same purpose to a greater or less degree. The bolt 15, is also isolated from the switchboard and magnet-frame byl a tube or Spool 18 of the same material so t at no vibrations can be transmitted from the magnet-frame to the switch-board directly through the bolt.

The armature andlever 11 which are also subject to vibration are isolated in a similar manner from the bra ket at. As shown in Figs. 3 and 4, the lever 11 is provided with a transverse opening extending therethrough to receive a cylindrical plug 19 with a sleeve 20 of rubber or other suit able material between said plug and lever for absorbing vibrations. The ends of the plug 19 are recessed to receive the conical bearings 20 adjustably mounted in the lugs 12. It will thus be seen that the magnet and its armature have no connection whatever with the switch-board, exceptthrough rubber or other material for absorbing vibrations.

In Figs. 5 and 6 is shown a means for connecting the sounding board 1 and the standards or supports 21 with rubber or the like interposed. The standard 21 is formed with an l.-shaped recess 22 to receive the corner of the switch-board, the partsbeing secured in position by a bolt 23, with a section of rubber or other sound absorbing material 24 in position between the parts. The body and head of the bolt 23 are separated from the switch-board l by the sleeve 25 and washer :26, respectively, the parts 25 and 26 being made of sound absorbing material as above described. p

The means shown in Figs. 3 and 4 for absorbing vibrations may be used in conjunction with the means shown in Figs. 5 and =3, or either of said means may be used alone as may be desired.

it will be understood that the specilic applications of my invention as herein glisclosed are merely illustrative of the varius ways in which my invention may be used, and that in general the invention adapted for use wherever it is desirable to reduce or prevent the vibrations produced by alternating current magnets.

Various changes in the details or" construction and arrangement of parts herein disclosed might also be made by those skilled in the art without departing from Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

the spirit and scope of the invention. I wish therefore not to be limited to the precise construction disclosed.

TV hat I claim as new and desire to have protected by Letters Patent of the United States is w 1. The combination with a magnebframe, of a support therefor, a bolt securing said parts together, and a sleeve on said bolt of material for absorbing vibrations.

2. The combination with an electromag net. of an armature therefor, a support to which the armature is pivotally connected, and means interposed between the armature and its support for absorbing vibrations produced in the armature.

3. The combination with a lever, of means for producing mechanical vibrations therein, a bearing block secured to said lever but separated therefrom by material for preventing the transmission of said vibrations, and a support for said lever provided with stationary hearings.

4. The combination with alever, of means for producing vibrations therein, a bearing plug carried by said lever but separated therefrom by a sleeve of vibration-absorbing material, and a carrying member having journal bearings for said plug.

5. The combination with a switch-board, of an electromagnet carried thereby, an armature for said electromagnethaving pivoted connection with the switch-board, and material for absorbing mechanical vibr tions interposed between the switch-board and the magnet-frame and armature.

G. The combination with a switch board, of an electromagnet framemounted thereon, means interposed between said parts for absorbing vibrations, an armature lever, a support for said lever secured to the switch board. and sound deadening material interposed between said lever and its support.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

AUGUST SUNDH. ll itnesses CHAS. M. Nissan, JAMns D. Evans.

Washington, D. G. 

